# MathForge vs DuoSub

The clearest difference is in-app purchases: MathForge at none against DuoSub's 3. MathForge also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. DuoSub sells 3 in-app purchases, starting at $4.99 per month. MathForge asks for nothing beyond the download.

MathForge ships an update every 3 days, DuoSub every 5 days. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | MathForge | DuoSub |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 5 days |
| Size | 5 MB | 12 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Anil Sharma](https://appshunter.io/developer/6781760053) | [Vui Nguyen](https://appshunter.io/developer/1697789456) |

## What reviewers say

### MathForge

[App page](https://appshunter.io/ios/app/mathforge-skill-quest/id6787271515)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### DuoSub

[App page](https://appshunter.io/ios/app/duosub-subtitle-translator/id6799621505)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuoSub Pro - 1 Month | $4.99 | per month |
| DuoSub Pro - 3 Months | $9.99 | per 3 months |
| DuoSub Pro - 1 Year | $24.99 | per year |


## Frequently asked questions

### Is MathForge free?

MathForge is free to download, with no in-app purchases.

### Is DuoSub free?

DuoSub is free to download, with in-app purchases available.

### Do MathForge or DuoSub have ads?

DuoSub shows ads; MathForge does not.

### Which is updated more often, MathForge or DuoSub?

MathForge ships an update every 3 days, and DuoSub every 5 days. Most recently, MathForge was updated on October 8, 2026 and DuoSub on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*